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I have a vector<Mat> with images with different size.

Then I have a bigger image (let's say 640x480) I want to make a grid like this:

With variable numbers of cols. How would you do that?

I have a vector<Mat> with images with different size.

Then I have a bigger image (let's say 640x480) I want to make a grid collage like this:

With variable numbers of cols. How would you do that?